linux-kernel - [lkp-robot] [amd64] 122b05ddf5: will-it-scale.per_process

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Date:   Tue, 25 Apr 2017 08:57:37 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>, lkp@...org
Subject: [lkp-robot] [amd64]  122b05ddf5:  will-it-scale.per_process_ops
 12.8% improvement


Greeting,

FYI, we noticed a 12.8% improvement of will-it-scale.per_process_ops due to commit:


commit: 122b05ddf506e637336dcf64b5a129825f7bf6d4 ("amd64: get rid of zeroing")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master

in testcase: will-it-scale
on test machine: 48 threads 2 sockets Intel(R) Xeon(R) CPU E5-2697 v2 @ 2.70GHz with 64G memory
with following parameters:

	nr_task: 100%
	test: poll1
	cpufreq_governor: performance

test-description: Will It Scale takes a testcase and runs it from 1 through to n parallel copies to see if the testcase will scale. It builds both a process and threads based test in order to see any differences between the two.
test-url: https://github.com/antonblanchard/will-it-scale



Details are as below:
-------------------------------------------------------------------------------------------------->


To reproduce:

        git clone https://github.com/01org/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml

testcase/path_params/tbox_group/run: will-it-scale/100%-poll1-performance/ivb42

d597580d373774b1  122b05ddf506e637336dcf64b5  
----------------  --------------------------  
         %stddev      change         %stddev
             \          |                \  
   5625707              13%    6346915        will-it-scale.per_process_ops
   4531969               8%    4891806        will-it-scale.per_thread_ops
      3016               8%       3260        will-it-scale.time.user_time
     11415                       11170        will-it-scale.time.system_time
 1.207e+09               4%  1.256e+09        perf-stat.cache-references
 1.507e+13                   1.485e+13        perf-stat.branch-instructions
 1.607e+13                   1.579e+13        perf-stat.dTLB-stores
 7.534e+13                   7.397e+13        perf-stat.instructions
      0.88                        0.86        perf-stat.ipc
 2.037e+13              -5%  1.925e+13        perf-stat.dTLB-loads



                             will-it-scale.per_thread_ops

  5.2e+06 ++----------------------------------------------------------------+
          O  O               O  O                                           |
  5.1e+06 ++    O    O             O  O       O  O O  O                     |
          |             O  O            O                                   |
    5e+06 ++      O                        O                O               |
  4.9e+06 ++                                                  O  O  O    O  O
          |                                              O             O    |
  4.8e+06 ++                                                                |
          |                                                                 |
  4.7e+06 ++    *.*..                                                       |
  4.6e+06 ++  ..                                     .*..                   |
          *..*       *..*                 .*..*..*.*.    *..*               |
  4.5e+06 ++             +   *..*..*..*.*.                                  |
          |               + +                                               |
  4.4e+06 ++---------------*------------------------------------------------+

  [*] bisect-good sample
  [O] bisect-bad  sample


Disclaimer:
Results have been estimated based on internal Intel analysis and are provided
for informational purposes only. Any difference in system hardware or software
design or configuration may affect actual performance.


Thanks,
Xiaolong

View attachment "config-4.11.0-rc1-00009-g122b05d" of type "text/plain" (157941 bytes)

View attachment "job-script" of type "text/plain" (6824 bytes)

View attachment "job.yaml" of type "text/plain" (4436 bytes)

View attachment "reproduce" of type "text/plain" (134 bytes)